Sol Campbell quit Notts County after playing only one game because he did not believe that the promised investment from the club's secretive backers Munto Finance would ever materialise, according to Andy Cole.

Former Manchester United and England striker Cole, who is a close friend of Campbell, claims that the £40,000-a-week defender had expected to see more investment in the Meadow Lane playing personnel before the close of the transfer window. Such spending failed to materialise.

Sol searching: Campbell quit Notts County after just one game following a series of empty promises, according to close friend Andy Cole

Cole, who played with Campbell for England and Portsmouth, wrote in his column in The Independent: 'I can tell you that he [Sol] left Notts County because of what he perceived as unkept promises.

'He has now left County because he had been led to believe there would be major resources invested at Meadow Lane rapidly and obviously, not just in new players but in facilities and infrastructure. That has not happened.'

Campbell, 35, played in last weekend's 2-1 defeat at Morecambe and appears to have quickly reached the decision to walk away from his £10million, five-year contract.

Cole added: 'Sol didn't see what he assumed would be quick, significant changes during his early weeks at the club. That has raised enough doubts in his mind to get out, and quickly.'

Driven out: It is alleged Munto's recent backing for F1 outfit BMW Sauber was one of the reasons that forced Sol Campbell to suddenly quit the League Two club

It is alleged that Campbell came to believe that Munto's money was being channeled into their newly acquired Formula One team BMW Sauber rather than Notts County.

Decision time: Free agent Campbell is now pondering his next move following his Meadow Lane exit

Having been told by the director of football, Sven Goran Eriksson, that his ambition to become a coach and a manager could be fulfilled at the club, currently in England's fourth tier, Campbell quickly lost faith in the project.

Campbell was photographed near his Chelsea home in west London on Wednesday and is believed to be considering his next move, although he will be unable to sign for another club until the January transfer window.

Munto Finance are owned by the Swiss-based investment company Qadbak. They were gifted their controlling 60 per cent stake by a supporters' trust who previously had control of the club.

They appointed Eriksson in a blaze of publicity and signed Campbell in August but since then have been less than supportive of manager Ian McParland.